I got this:

Pentium (R) D CPU 2.8 GHz
2 GB ram
GeForce 7950 GT
2HDD x 160GB sata2
Sound Max
When i play some games...like unreal 3,WoW and dota....sometimes...for no reason...my FPS's drop so low....from 64-66 to 14-15......I reinstalled and format all my pc....for nothing..pls help..

This can be caused by not having up-to-date drivers.

Suggestion:

Click on this link...DriverAgent.com Fix Your Driver Problems Instantly with DriverAgent
After the scan is done, click on the IE Page at the top of your IE window then click on Save As...
You want to save the report in the .mht format.
Save the scan report to your desktop (that way it will be easier to find).

Second, click on this link...What's inside my PC?
After the scan is done, use the procedure above to save the report.

Now, attached both the Belarc and the driver reports to your next reply.

How do I attach a file? I'll tell you.

To attach files to a reply, look under the Message text window, you'll see a button that says Manage Attachments.
Click on the button. Now click on the browse button and browse to your desktop to select the previously saved files.

The good news is it's all free.

This may be caused by Intel Speedstep Technology. Go into your bios and make sure this is disabled.